PLS-10R

• A multi-functional sensor for monitoring leaf net CO₂ exchange, transpiration, stomatal conductance, leaf temperature, and key environmental factors.
• Simple to use, low maintenance, and non-destructive.
• Gas exchange measured in the leaf’s real micro-environment.
• Data logger friendly, scalable, multi-nodes, with SDI-12 digital output.
• Suitable for glasshouse, growth cabinets, and certain field applications.

the PLS-10R instrument redefines how leaf gas exchange is measured

Rather than capturing isolated, operator-dependent snapshots of plant function, it enables continuous, autonomous, leaf-level physiology—revealing how photosynthesis, transpiration, and stomatal regulation evolve over time, across treatments, and under real environmental variability.

By combining a fast, non-invasive motorised leaf chamber with integrated microclimate sensing, the PLS-10R delivers high-frequency gas-exchange measurements in the leaf's true physiological context. Each measurement is paired with simultaneous observations of light, temperature, humidity, CO₂, and vapour pressure deficit, allowing fluxes to be interpreted mechanistically rather than empirically.

Crucially, the PLS-10R shifts gas exchange from a manual, sequential technique to a scalable, networked methodology. Multiple sensors operate in parallel, enabling spatial replication, treatment comparisons, and long-term monitoring that cannot be achieved with hand-held systems. This transforms gas exchange from a bottleneck measurement into a foundational data stream for phenotyping, eco-physiology, and climate-response research.

The result is not simply more data, but better science: reduced operator bias, improved temporal resolution, and direct insight into dynamic processes such as drought stress development, diel regulation, acclimation, and recovery. In doing so, the PLS-10R bridges the gap between controlled physiological measurements and the complexity of real plant–environment interactions.

PLS-10R does not replace traditional gas exchange systems—it completes them, extending classical methods into a domain where time, replication, and realism matter most.

rethinking leaf gas exchange measurement

Classical handheld gas-exchange systems have long been indispensable for high-precision, point-based measurements of leaf photosynthesis and transpiration. However, many contemporary research questions in plant physiology, ecophysiology, and climate–plant interactions extend beyond what can be captured by intermittent, operator-dependent measurements. Processes such as diel regulation, stress acclimation, and treatment-driven divergence often unfold over hours to weeks and require continuous, spatially replicated observation.

The PLS-10R Phyto-Sensor Pro system introduces a fundamentally different measurement paradigm. Rather than relying on sequential measurements from a single chamber, PLS-10R enables simultaneous, autonomous gas exchange monitoring across multiple leaves, operating continuously within a shared control and data infrastructure.

what is a multi-node gas exchange system?

A multi-node gas exchange system comprises multiple PLS-10R Phyto-Sensor Pro units deployed in parallel on different leaves, plants, or experimental treatments. Each PLS-10R sensor functions as a fully autonomous leaf chamber, performing independent gas exchange measurements while remaining synchronised through centralised system coordination.

This architecture allows researchers to:

• Monitor numerous leaves simultaneously
• Collect continuous datasets over days to weeks without operator intervention
• Distribute sensors spatially across greenhouse compartments, growth chambers, or controlled field plots

By scaling gas exchange from a single point to a distributed network, PTM-NG26 supports experimental designs that explicitly incorporate replication, heterogeneity, and temporal dynamics.

integrated leaf-level microenvironment characterisation

Each PLS-10R sensor measures not only gas exchange but also the local microenvironment experienced by the leaf during every measurement cycle. Recorded variables include:

• Leaf temperature
• Air temperature and relative humidity
• Photosynthetically active radiation (PAR)
• Atmospheric pressure
• Ambient CO₂ concentration

PAR is quantified using an optical diffuser integrated directly into the sensor housing. This design reproduces the geometry of the leaf chamber and accounts for both light incidence angle and chamber shading effects. As a result, gas exchange data can be interpreted in the context of the actual irradiance conditions experienced by each individual leaf, rather than relying on external or bulk light measurements.

This tight coupling of physiological fluxes with local environmental drivers enables more robust interpretation of treatment effects, stress responses, and model–data comparisons.

complementing hand-held gas exchange systems

The PLS-10R system is designed to complement, not replace, classical handheld gas-exchange instruments such as the LI-6800. While handheld systems remain unmatched for rapid surveys, controlled-response curves, and targeted diagnostics, they are inherently limited in temporal coverage and replication.

The PLS-10R extends gas exchange methodology into domains that are otherwise difficult or impossible to access, including:

• Long-term, unattended measurements
• True parallel replication across treatments
• Capture of transient and fluctuating environmental responses

Together, hand-held systems and PLS-10R multi-node networks provide a more complete and physiologically informative picture than either approach alone.

typical research applications

The PLS-10R system is well-suited to a wide range of advanced research applications, including:

• Drought and plant water-stress experiments
• Greenhouse and growth-chamber CO₂ enrichment studies
• Genotype, cultivar, or treatment comparisons with spatial replication
• Diel and multi-day dynamics of photosynthesis and transpiration
• Validation and parameterisation of physiological and ecohydrological models under realistic microclimatic conditions